import com.mysql.jdbc.Connection;
import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import javax.xml.crypto.Data;
import javax.xml.transform.Result;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * user:likai
 * Date:2022-12-26
 * Time:10:06
 */
//封装数据库
public class DBUtil {
    private static volatile DataSource dataSource=null;
    public static DataSource getDataSource(){
        if (dataSource==null){
            synchronized (DBUtil.class){
                if (dataSource==null){
                    dataSource =new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setUrl("jdbc:mysql://127.0.0.1:3306/blog_system?characterEncoding=utf8&useSSL=false");
                    ((MysqlDataSource)dataSource).setUser("root");
                    ((MysqlDataSource)dataSource).setPassword("");
                }
            }
        }
        return dataSource;
    }
    public static Connection getConnection() throws SQLException {
        return (Connection) getDataSource().getConnection();
    }
    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet){
        if(resultSet!=null){
            try {
                resultSet.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
        if(statement!=null){
            try {
                statement.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
        if(connection!=null){
            try {
                connection.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
